Response of Tomato and Pepper to Monopotassium Phosphate-Based Starter Solutions George J. Hochmuth 1
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1 Institute of Food and Agricultural Sciences North Florida Research and Education Center Suwannee Valley Response of Tomato and Pepper to Monopotassium Phosphate-Based Starter Solutions George J. Hochmuth 1 Introduction Research with tomato and pepper responses to monopotassium phosphate-based starter fertilizers was conducted at the University of Florida Horticultural Sciences Research Unit in Gainesville, FL during the spring season of the objectives were to determine if tomato and pepper respond to starter fertilizer solutions and to compare several starter solution formulations for effects on tomato and pepper fruit yield. The soil used for the research was Arrendondo fine sand that tested medium in K and high in P, Mg, Ca, and micronutrients. The soil was plowed and disked in preparation for bedding, fertilization, and planting. Beds were raised in rough fashion with bedding disks and 30 lbs N and 30 lbs K 2 O per acre were applied to the pre-beds. Beds were then rototilled and pressed and were spaced 4 ft center-to-center and were 6 inches high and 24 inches across the top surface. Beds were fumigated with methyl bromide, drip tube was applied in bed center, and beds were covered with black polyethylene mulch. Starter solutions tested were 1. 0 N 10 P 2 O 5 7 K 2 O (monopotassium phosphate, MKP) N 34 P 2 O 5 0 K 2 O (ammonium polyphosphate, APP) 3. 2 N 14 P 2 O 5 3 K 2 O (1:2 ratio of monopotassium phosphate, MDP and monoammonium phosphate, MAP) 4. 3 N 22 P 2 O 5 15 K 2 O (ammoniated MDP, AMKP) 5. A control treatment (no starter). The experiment was conducted in two plantings (early, 25 March and late, 1 April) and tomato and pepper were used as the test crops. Tomatoes ( Agriset 761 ) and pepper ( Camelot X3R ) were planted for both dates, tomatoes in single-row fashion on 18-inch spacing and peppers in twin-row fashion with 12-inches between plants and 12-inches between rows. Tomatoes were planted in plots 25 ft long and peppers in plots 20 ft long. 1 George J. Hochmuth, Professor, Horticultural Sciences Department, University of Florida/IFAS, Gainesville FL
2 Starter solution rates were calculated based on 10 lbs P 2 O 5 for tomatoes and applied in 250 milliliters of solution. The same solution and concentrations were used for pepper. Therefore, peppers received more starter on an acre basis due to higher plant population. Tomato and pepper plants were irrigated by drip irrigation (Roberts Row-Drip) to maintain moisture at -10 centibars in the root zone. Insects and diseases were controlled by timely applications of labeled pesticides. No pest problems were encountered in the season. On 30 April, one whole tomato plant at first flower was sampled from planting two for dry weight measurements. Plants from planting one were not sampled due to nonuniform plant stands. Whole pepper plants (two) at early buds were sampled from both plantings (30 Apr for planting one and 8 May for planting two). Tomatoes were harvested on 6, 13, and 23 June and peppers were harvested on 3, 10, and 17 June for the first planting. For the second planting, tomatoes were harvested on 16, 23, and 30 June and peppers on 10, 17, and 24 June. Fruits were graded into extra large, large, medium, and cull fruits, and weighed. All data were analyzed by analysis of variance. Results and Discussion Tomato: There were no interactions of planting date and starter solution. Early tomato fruit yield was greater from the second planting compared to the earlier planting (Table 1). Total marketable early yields were 70% greater for the second planting. Cool temperatures and heavy rains inflicted damage on plants in the first planting soon after transplanting. Early extra large fruit yield was greater with certain starter solutions compared to the control. Yields of extra large fruits, the most valuable fruits, were enhanced with MKP/MAP and APP starter solutions. Total early yield was not affected by starter solutions. Seasonal yields were greater from planting one (Table 1). Even though plants in the first planting were exposed to stress and early yield was negatively affected, the plants recovered well and seasonal yield was greater than for planting two. Seasonal yield was not affected by starter solution. Pepper: Yields of early extra large and total early marketable pepper fruits were affected by the interaction of planting date and starter solution (Tables 2, 3). Early extra large fruit yield in plating one was greatest with AMKP and in planting two was 2
3 greatest with MKP/MAP mixture and APP (Table 3). For total early marketable yield, the results were the same (Table 3). Early large fruit yield was greater from planting one compared to planting two (Table 2). Early large fruit yield was not affected by starter solution. Yields of medium-sized fruits or cull fruits were not affected by planting date or starter solution. Seasonal fruit production was greater for most grade categories in planting one compared to two (Table 3). Pepper fruit for the season was not affected by starter solution. Starter solution benefited early but not total season fruit yield of pepper. However, there were not significant affects on early plant growth (Table 4). Beneficial effects could have originated in enhanced fruit growth and development during the early part of the season. Positive effects on extra large fruit yields are important since this grade is the most valuable fruit grade. Summary 1. Starter solutions composed of MKP had positive effects on tomato and pepper fruit yields in a warm and wet season. 2. Positive effects were mostly on extra large fruits, especially for pepper. These are the most valuable fruits. 3
4 Treatments Tomatoes = 25 foot plots = 17 plants/plot times 4 reps equals 68 plants/treatment Pepper = 20 foot plots = 40 plants per plot times 4 reps equals 160 plants Therefore: Calculate rate based on tomato. Tomato we want 10 lbs P 2 O 5 per acre for plants on 18-inch spacing and on 4-ft centers = 7260 plants per acre. So, 10 lbs P 2 O 5 per 7260 plants = lbs P 2 O 5 per plant or gr P 2 O 5 per plant. 1. MKP (0-10-7) has lbs/gal specific weight, which is lbs P 2 O 5 /gal or 469 gr P 2 O 5 per gal. For tomato: gr P 2 O 5 /plant x 68 plants equals 43 gr P 2 O 5 needed. Therefore, 43/469 = 0.09 gal needed for each tomato plant. There are 68 plants x 250 ml/plant = 17 liter. Therefore, we need 0.09 gal in 17 liter. Make 10% excess, so 0.10 gal in 19 liter or 378 ml in 19 liter. For pepper: Use same recipe so we have same concentration but total rate per acre will differ. 2. AMKP ( ) is lb/al specific weight equals lb P 2 O 5 per gallon equals 1223 gr P 2 O 5 /gal. We want gr P 2 O 5 per plant, which equals x 68 plants per treatment equals 43 gr P 2 O 5 needed. 43 gr/1223 = gal x 3780 ml/gal equals 132 mls of plus 10% excess equals 145 mls in 19 liters. For pepper: use same recipe. 3. APP ( ) has lb/gallon equals lbs P 2 O 5 /gal or 1787 gr P 2 O 5 /gal. Therefore: 43 gr/1787 = gal = 91 ml plus 10% excess = 100 ml in 19 liters for tomato. For pepper: use same recipe. 4. MKP + MAP (1:2) Tomato: we ant gr P 2 O 5 /plant equals 68 plants x = 43 gr P 2 O 5 MDP = MAP in 1:2 weight Mixture is a salt. Therefore: 43 gr/0.58 = 74 gr of the mixture. Mixture: 1/3 from MKP = 24 gr plus 10% = 27 gr 2/3 from MAP = 50 gr plus 10% = 55 gr Mix 27 gr MKP plus 55 gr MAP in 19 liters For pepper use same recipe. 5. Control no starter solutions, only water 4
5 Table 1. Effects of planting and starter solution on tomato fruit yield and grade, Gainesville FL. Spring Planting Starter Yield (25-lb ctn/acre) Marketable Solution Extra Lg Large Medium Cull Market No Early (first harvest) One Two Signif. z NS ** ** ** ** ** AMKP APP MKP MKP/MAP Control LSD (.05) 160 NS NS NS NS NS Season (3 harvests) One Two Signif. z ** ** NS NS ** ** AMKP APP MKP MKP/MAP Control LSD (.05) NS NS NS NS NS NS z Treatments significant 1% (**) or 5% (*) probability level or not significant (NS). 5
6 Table 2. Effects of planting and starter solution on pepper fruit yield and grade, Gainesville FL. Spring Planting Starter Yield (28-lb ctn/acre) Marketable Solution Extra Lg Large Medium Cull Market No Early (first harvest) One Two Signif. z ** y * NS NS ** y ** AMKP APP MKP MKP/MAP Control LSD (.05) * y NS NS NS * y NS Season (3 harvests) One Two Signif. z * ** ** ** NS NS AMKP APP MKP MKP/MAP Control LSD (.05) NS NS NS NS NS NS z Treatments significant 1% (**) or 5% (*) probability level or not significant (NS). y Interaction significant. 6
7 Table 3. Interaction of planting date and starter fertilizer material for extra large and total marketable pepper fruit yield. Planting z Starter Solution z Yield (28-lb ctn/acre) Extra large Total Marketable One AMKP APP MKP MKP/MAP Control Two AMKP APP MKP MKP/MAP Control z LSD (.05) = 130 for comparing any two means for extra large fruit and LSD (.05) = 133 for comparing any two means for total marketable fruit. Table 4. Effects of starter solution on tomato and pepper early plant growth, Gainesville FL. Spring Starter Solution Tomato y Pepper z 30 April 30 April (1) 8 May (2) g/plant MKP AMKP APP MKP/MAP Control z Pepper sampling was for early growth samples at early bud for first planting (1) and for second planting (2). y tomato sample for first flower open for planting 2 only. 7
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